The bug
The shulker box top texture appears unusually dark, the interior textures don't show up at all. The shulker mob itself seems to render normal, it only affects shulker boxes.
Linked issues
is duplicated by 6
MC-161422
Incorrect rendering in the shulker box
Resolved
MC-161838
Shulker Boxes cull faces incorrectly
Resolved
MC-161963
Shulker insides are not rendering
Resolved
MC-162246
Shulker boxes bottom texture invisible when opening from above, and top texture when below
Resolved
MC-162612
Shulker Boxes' backfaces are invisible
Resolved
1 more links
Same, I also have this issues...